Bung Wrench Non -Sparking Secure Tools supplies Non-Sparking Drum Bung Wrenches. They are designed to remove the plastic or metal caps from barrels or drums. The drum plugs are screwed into a flange on the drum and the Non-Sparking Drum Bung wrench is used to tighten the plug to prevent leakage. The Non-Sparking Bung Drum wrench can be used to slowly loosen plugs to safely release any pressure inside the drum before the plug is removed.